drm/nouveau: Don't enabling polling twice on runtime resume

[ Upstream commit cae9ff036eea577856d5b12860b4c79c5e71db4a ]

As it turns out, on cards that actually have CRTCs on them we're already
calling drm_kms_helper_poll_enable(drm_dev) from
nouveau_display_resume() before we call it in
nouveau_pmops_runtime_resume(). This leads us to accidentally trying to
enable polling twice, which results in a potential deadlock between the
RPM locks and drm_dev->mode_config.mutex if we end up trying to enable
polling the second time while output_poll_execute is running and holding
the mode_config lock. As such, make sure we only enable polling in
nouveau_pmops_runtime_resume() if we need to.

This fixes hangs observed on the ThinkPad W541

Signed-off-by: Lyude <lyude@redhat.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Cc: Kilian Singer <kilian.singer@quantumtechnology.info>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: David Airlie <airlied@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/nouveau/nouveau_display.c b/drivers/gpu/drm/nouveau/nouveau_display.c
index 3cd2b8a..73c8c57 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_display.c
+++ b/drivers/gpu/drm/nouveau/nouveau_display.c
@@ -421,7 +421,8 @@ nouveau_display_init(struct drm_device *dev)
                return ret;
 
        /* enable polling for external displays */
-       drm_kms_helper_poll_enable(dev);
+       if (!dev->mode_config.poll_enabled)
+               drm_kms_helper_poll_enable(dev);
 
        /* enable hotplug interrupts */
        list_for_each_entry(connector, &dev->mode_config.connector_list, head) {

diff --git a/drivers/gpu/drm/nouveau/nouveau_drm.c b/drivers/gpu/drm/nouveau/nouveau_drm.c
index 3100fd8..8b5068c 100644 (file)
--- a/drivers/gpu/drm/nouveau/nouveau_drm.c
+++ b/drivers/gpu/drm/nouveau/nouveau_drm.c
@@ -761,7 +761,10 @@ nouveau_pmops_runtime_resume(struct device *dev)
        pci_set_master(pdev);
 
        ret = nouveau_do_resume(drm_dev, true);
-       drm_kms_helper_poll_enable(drm_dev);
+
+       if (!drm_dev->mode_config.poll_enabled)
+               drm_kms_helper_poll_enable(drm_dev);
+
        /* do magic */
        nvif_mask(&device->object, 0x088488, (1 << 25), (1 << 25));
        vga_switcheroo_set_dynamic_switch(pdev, VGA_SWITCHEROO_ON);